bromberg



Feb. 21, 1956 E. s. BROMBERG 2,735,365

ELEVATOR STRUCTURE FOR PRINTING PRES-SE5 Filed July as, 1955 2 Sheets-Sheet 1 \%9 INVENTOR.

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ELEVATOR STRUCTURE FOR PRINTING PRESSES Filed July 28, 1953 2 Sheets-Sheet 2 2g 26 W22 42 i3 9 8 9 16 5 111 W o United States Patent ELEVATOR STRUCTURE FOR PRINTING PRESSES Edward S. Bromberg, Dallas, Tex., assignor to Pollock Paper Corporation, Dallas, Tex., a corporation of Texas Application July 28, 1953, Serial No. 370,663 3 Claims. (Cl. 101181) This invention relates to elevator structures and more particularly to elevators adapted for use in servicing printing presses.

In performing various service operations on large printing presses, such as, for example, a six color press, it has heretofore been the practice of workmen to employ the use of platforms, scaffolds, ladders, etc., to reach the upper portions of the presses. As it is difficult and sometimes hazardous for workmen loaded with tools, printing plates, printing rolls, etc., to ascend and descend ladders between roll stacks, the present invention contemplates the provision of an elevator structure embodying a working platform capable of supporting workmen and movable vertically between the inking and printing sections of the press.

It is an object of the present invention to provide an elevator structure in which the working platform is supported for movement along an arcuate line of travel between the top and bottom of a roll stack.

Another object of the invention resides in the provision of means for maintaining the working platform horizontally at all times during its movement between the upper and lower ends of a roll stack.

A further object of the invention resides in the provision of means manually operable from the working platform for controlling the movement of the latter between the upper and lower ends of the roll stack.

Another object of the invention resides in the provision of an elevator structure adapted to be readily mounted upon the side frames of a printing press.

Another object of the invention resides in the provision of an elevator structure in which the working platform extends adjacent and parallel to the rolls of a roll stack and is supported for movement along an arcuate line of travel by a pair of arms journaled on suitable brackets secured to the side frames of the roll stack.

Another object of the invention resides in the provision of means manually operable from adjacent the base of a roll stack for moving the working platform to a position adjacent the top of the roll stack where it does not interfere with the normal operation of the press.

This invention embodies other novel features, details of construction and arrangement of parts which are hereinafter set forth in the specification and claims and illustrated in the accompanying drawings, wherein:

Fig. 1 is a side elevational view illustrating an elevator structure embodying features of the present invention, the structure being shown as applied to a roll stack of a six color press.

Fig. 2 is a top plan view of same.

Fig. 3 is a wiring diagram showing the electrical control means employed to operate the elevator.

Referring now to the drawings for a better understanding of the invention, the elevator structure 6 is shown as applied to a roll stack 7 comprising a stack of rolls 8 journaled at their ends in spaced side frames 9 and 10, the roll stack forming part of a conventional six color printing press and spaced from an. adjacent movable ink roll stack 7a.

The elevator structure. isshown as comprising a platform 11 secured to shaft 12 having its ends journal'ed' in bearings 13 formedon the outer ends of platform support arms 14-14, each bearing, 13 being engaged between spaced collars 16-16 secured to the shaft. The support arms are journaled at their inner ends upon stud shafts 17-17 welded or otherwise secured to brackets 18-18 mounted on their respective side frames 9-and 10 by means of cap screws 19.

The flat upper surface 21 of. the-platform 11 is maintained in a horizontal plane by means of. parallel motion mechanisms 22-22 shown as comprising inner levers 23-23 keyed intermediate their ends to their respective stud shafts 17, and outer levers 24-24 keyed intermediate their ends to opposite ends of the shaft 12'. Upper connecting links 26-26 extend between and are pivotally connected to the upper ends of related levers 23 and 24, and lower connecting links 27-27 extend between and are pivotally connected to the lower ends of related levers 23 and 24.

Sprocket segments 28-28 are secured to the inner ends of their respective platform support arms 14-14 for engagement by sprocket chains 29-29 having their lower ends secured at 31-31 to their related sprocket segments, the chains extending upwardly over sprockets 32-32 cap screws 42. The other ends of the sprocket chains 29-29 extend downwardly into their respective hoppers A reversible electric brake motor 44 is mounted on the base plate 41 and connected to a conventional worm gear drive shaft 33 by means of an endless chain 51. Chain guide brackets 52-52a are mounted on the bracket 38 and base plate 41, respectively, to prevent displacement of the chains 29-29 from their related sprockets 32-32.

The reversible electric brake motor 44 is adapted to be connected to a suitable source of electric current and controlled by a conventional reversing starter 53, platform push button switches 54 and 56, remote control push button switches 57 and 58, upper and lower limit switches 59 and 61, respectively, and a press limit switch 60 connected in series with the platform switches and remote control switches.

During operation of the printing press, the platform 11 is disposed adjacent the upper end of the roll stack 7.

moved downwardly when the operator closes the remote control switch 58 to permit the operator to step onto the platform. During servicing of the press, the operator of the servicing operation, he closes the switch 57 to raise the platform to its inoperative position adjacent the upper end of the roll stack.

to thus prevent damage to the press or e evator structure. While this invention has been shown in but one form, it is obvious to those skilled in the art that it is not solimited, but is susceptible of various changes and modifications without departing from the spirit and scope of the claimed invention.

I claim as my invention:

1. In a printing press, a roll stack comprising vertically spaced print rolls arranged in an arcuate series, pivotally mounted platform support arms provided for movement relative to said rolls, a platform supported for pivotal movement on the free ends of said support arms for vertical movement along an arcuate line of travel generally parallel to the arcuate series of rolls responsive to pivotal movement of said arms, and means to maintain said platform parallel to a horizontal plane during vertical movement traversing said rolls.

2. In a printing press, a roll stack comprising vertically spaced print rolls arranged in an arcuate series, pivotally mounted platform support arms provided for movement relative to said rolls, a platform supported for pivotal movement on the free ends of said support arms for vertical movement along an arcuate line of travel generally parallel to the arcuate series of rolls responsive to pivotal movement of said arms, and means to maintain said platform parallel to a horizontal plane during vertical movement traversing said rolls, said means comprising a parallel motion mechanism.

3. In a printing press, a roll stack comprising vertically spaced print rolls arranged in an arcuate series, pivotally mounted platform support arms provided for movement relative to said rolls, a platform supported for pivotal movement on the free ends of said support arms for vertical movement along an arcuate line of travel generally parallel to the arcuate series of rolls responsive to pivotal movement of said arms, means to maintain said platform parallel to a horizontal plane during vertical movement traversing said rolls, said means comprising a parallel motion mechanism, and actuating means to pivot said arms to raise and lower said platform.

References Cited in the file of this patent UNITED STATES PATENTS 510,147 Tarbox Dec. 5, 1893 682,932 Halton Sept. 17, 1901 1,110,469 Vannentyne Sept. 15, 1914 1,141,928 Brown June 8, 1915 1,268,607 Pettis June 4, 1918 1,332,227 Norman Mar. 2, 1920 1,362,555 Bearsley Dec. 14, 1920 1,952,028 Hehle et al. Mar. 20, 1934 2,012,245 Meisel Aug. 20, 1935 2,483,811 Cullen Oct. 4, 1949 2,616,768 Stemm Nov. 4, 1952 

